Jan 28, 2013 3:00pm PST
a science lesson inspired by an announcement from nasa. hari sreenivasan has the details. >> sreenivasan: just what is dark matter? find a short video with a simple answer on today's science roundup. nasa and the european space agency are partnering to send a telescope into space to investigate dark matter and dark energy. read more about these mysterious forces and what scientists hope to find on our science page. and think you've received bad advice about social security? our benefits guru gets to the bottom of that issue in today's "ask larry" column on our business page. all that and more is on our web site, newshour.pbs.org. gwen? >> ifill: and that's the newshour for tonight. on tuesday, we'll return to the immigration debate with a look at the president's plans for reform. i'm gwen ifill. >> woodruff: and i'm judy woodruff. we'll see you online, and again here tomorrow evening. thank you, and good night. >> major funding for the pbs newshour has been provided by: >> bnsf railway. >> macarthur foundation. >> and with the ongoing support of these institutions and foundations. and...
Feb 1, 2013 3:00pm PST
on at least until the end of february, or until president obama names his successor. nasa paused today to remember the lives of seven astronauts who died ten years ago when space shuttle "columbia" broke apart in the air over texas. a few hundred people gathered at kennedy space center in florida, including family members and other astronauts. the accident happened as the shuttle was returning home with only 16 minutes left till landing. the brash, bold-talking former mayor of new york city, ed koch, died today of congestive heart failure at a hospital in new york. >> good morning. i'm ed koch, and i'm running for mayor. how am i doing? >> sreenivasan: ed koch was most at home on the streets of manhattan. a quintessential new yorker, the larger than life koch, who ran city hall from 1978 to 1989, was best known for shepherding new york out of financial ruin, restoring the city's finances through tough budget cuts, and improving its decaying subway system. but he insisted his biggest personal achievement was rallying new yorkers through the 1980 transit strike that crippled the city. st